The Evansville year in pollen
Pollen seasons in Evansville: tree pollen February to May, grass May to July, and ragweed from early August until the first frost, around October 29.
First frost lands around October 29 in Evansville — about 8 days later than Indiana overall — which shifts when ragweed season ends here.
When does ragweed season end in Evansville?
Ragweed season in Evansville typically ends with the first frost, around October 29. Some years it comes as early as October 24, some as late as November 2.
A light frost around October 29 knocks the season down; the hard freeze that finishes it usually follows by November 8. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Evansville pollen year
| Allergen | Typical season |
|---|---|
| Oak | April to May |
| Maple | March to April |
| Elm | February to April |
| Birch | April to May |
| Ash | April to May |
| Hickory and walnut | April to May |
| Grass | May to July |
Season-by-season detail is on the Indiana page.
Nearby calendars
Frost dates for Evansville come from the Evansville Regional Airport weather station's 30-year records. Season windows reviewed August 2026.